# Building permits at 4100 S Union Ave, Chicago, IL Two permits on record here. The newest, Oct 3, 2025: Tenant build out of existing 782 sf building to new office including alteration to new toilet rooms occupancy. Within a quarter mile, the city has issued 9 more permits since May 1. ## At this address | Date | Type | Work | Cost | Permit | |---|---|---|---|---| | Oct 3, 2025 | Alteration or repair | Self-cert 2019 CBRC: tenant build out of existing 782 sf building to new office including alteration to new toilet rooms occupancy group B; type 3b construction) | $20,000 | [101074453](https://nearbypermits.com/chicago/permit/101074453/) | | Jan 10, 2013 | Electrical | Replace and relocate existing damaged edison service meter | $1,500 | [B100473607](https://nearbypermits.com/chicago/permit/B100473607/) | ## Within ¼ mi since May 1, 2026 9 permits in the circle. From our copy of the city's data (last 24 months). ### Next door (under 250 ft), 3 permits | Date | Address | Distance | Type | Work | Cost | Permit | |---|---|---|---|---|---|---| | Sep 1, 2026 | [4122 S Union Ave](https://nearbypermits.com/chicago/address/4122-s-union-ave/) | 230 ft S | Alteration or repair | Concrete masonry repair / replacemnt: 100sq. FT., Excavation = no. Location: exterior concrete deck. | $5,000 | [B200507886](https://nearbypermits.com/chicago/permit/B200507886/) | | Aug 12, 2026 | [4122 S Union Ave](https://nearbypermits.com/chicago/address/4122-s-union-ave/) | 230 ft S | Alteration or repair | Tuckpointing and unit masonry repair / replacement: 100 SQ. FT., Lintel qty. 0, MAX. Length 0. Parapet rebuilding: 50 SQ. FT. Location: front entrance platform; exterior brick; copings. | $7,500 | [B200481218](https://nearbypermits.com/chicago/permit/B200481218/) | | Aug 10, 2026 | [4122 S Union Ave](https://nearbypermits.com/chicago/address/4122-s-union-ave/) | 230 ft S | Fence, wall or deck | Purpose: new/replacement installation. Chain link fence - 6'-0' ' (height) x 300'-0' ' (length). Location: fencing on 41st street side and on union side. | $5,000 | [B200481438](https://nearbypermits.com/chicago/permit/B200481438/) | ### This block (250 to 1,000 ft), 3 permits | Date | Address | Distance | Type | Work | Cost | Permit | |---|---|---|---|---|---|---| | Sep 17, 2026 | [601 W Root St](https://nearbypermits.com/chicago/address/601-w-root-st/) | 860 ft SE | Alteration or repair | In-kind replacement of exterior windows and doors in existing openings. Replacement windows: 5; replacement skylights: 0; replacement doors: 0. Affects: 0 residential unit(s), 0 non-residential unit(s), location: exterior buildings window. | $10,000 | [B200511062](https://nearbypermits.com/chicago/permit/B200511062/) | | Jun 15, 2026 | [4041 S Emerald Ave](https://nearbypermits.com/chicago/address/4041-s-emerald-ave/) | 290 ft NW | Alteration or repair | Spr 2019 CBRC: interior alteration of an existing office as per plan. Installation of a roof over a previous open loading dock. Installation of a accessible ramp and a cooler inside the previous loading dock. Install a new facade in a previously open loading dock. (Occupancy group s-2, type IB const | $200,000 | [101074004](https://nearbypermits.com/chicago/permit/101074004/) | | May 29, 2026 | [600 W 41st St](https://nearbypermits.com/chicago/address/600-w-41st-st/) | 670 ft E | Alteration or repair | Revision to permit #101033866 to establish building is construction type IIIB existing non conforming. Eliminate the fire-proofing of existing roof construction as it is not required for IIIB per correction mediation meeting and certified plan corrections of previous permit. | $1,000 | [101082095](https://nearbypermits.com/chicago/permit/101082095/) | ### Farther (1,000 ft to ¼ mi), 3 permits | Date | Address | Distance | Type | Work | Cost | Permit | |---|---|---|---|---|---|---| | Oct 5, 2026 | [4200 S Halsted St](https://nearbypermits.com/chicago/address/4200-s-halsted-st/) | 0.23 mi SW | Electrical | Low voltage/communication electrical work. Install other. Specific location: main area. | $46,489 | [B200512351](https://nearbypermits.com/chicago/permit/B200512351/) | | Sep 24, 2026 | [615 W Pershing Rd](https://nearbypermits.com/chicago/address/615-w-pershing-rd/) | 0.24 mi NE | Roofing | Scope: roof recover. Area: 33600 SQ. FT. Roof covering: other. Location: the roof. IL Roofing contractor license: 104008589. | $471,232 | [B200513063](https://nearbypermits.com/chicago/permit/B200513063/) | | Aug 12, 2026 | [538 W Root St](https://nearbypermits.com/chicago/address/538-w-root-st/) | 0.20 mi SE | Fence, wall or deck | New detached wood frame garage. Dimensions and setbacks per application. Building outside dimensions: 22'-0' ' x20'-0' '. Gable roof height to peak: 14'-0' '. | $26,549 | [B200507092](https://nearbypermits.com/chicago/permit/B200507092/) | ## More on this street Other addresses on S Union Ave with permits, nearest house number first: - [4122 S Union Ave](https://nearbypermits.com/chicago/address/4122-s-union-ave/): newest permit Sep 1, 2026 - [4227 S Union Ave](https://nearbypermits.com/chicago/address/4227-s-union-ave/): newest permit Oct 27, 2025 - [4300 S Union Ave](https://nearbypermits.com/chicago/address/4300-s-union-ave/): newest permit Apr 8, 2025 - [3852 S Union Ave](https://nearbypermits.com/chicago/address/3852-s-union-ave/): newest permit Oct 29, 2024 - [3851 S Union Ave](https://nearbypermits.com/chicago/address/3851-s-union-ave/): newest permit Jun 24, 2025 - [3842 S Union Ave](https://nearbypermits.com/chicago/address/3842-s-union-ave/): newest permit May 4, 2026 - [4407 S Union Ave](https://nearbypermits.com/chicago/address/4407-s-union-ave/): newest permit Sep 3, 2026 - [4420 S Union Ave](https://nearbypermits.com/chicago/address/4420-s-union-ave/): newest permit Aug 20, 2026 - [4425 S Union Ave](https://nearbypermits.com/chicago/address/4425-s-union-ave/): newest permit Apr 10, 2026 - [4427 S Union Ave](https://nearbypermits.com/chicago/address/4427-s-union-ave/): newest permit Mar 19, 2026 --- Source: Chicago Department of Buildings permit data (https://data.cityofchicago.org/d/ydr8-5enu). Checked 2026-10-07 23:46 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/ This site provides applications using data that has been modified for use from its original source, www.cityofchicago.org, the official website of the City of Chicago. The City of Chicago makes no claims as to the content, accuracy, timeliness, or completeness of any of the data provided at this site. The data provided at this site is subject to change at any time. It is understood that the data provided at this site is being used at one’s own risk. Map, both permits at this address and 9 nearby: https://nearbypermits.com/chicago/address/4100-s-union-ave/